GitHub user CodingCat opened a pull request:
https://github.com/apache/spark/pull/15602
[SPARK-18058][SQL] [BACKPORT-2.0]Comparing column types ignoring
Nullability in Union and SetOperation
## What changes were proposed in this pull request?
The PR tries to fix
[SPARK-18058](https://issues.apache.org/jira/browse/SPARK-18058) which refers
to a bug that the column types are compared with the extra care about
Nullability in Union and SetOperation.
This PR converts the columns types by setting all fields as nullable before
comparison
## How was this patch tested?
regular unit test cases
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/CodingCat/spark branch-2.0
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15602.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15602
----
commit ce4b93c1d7046b7a3e4bee4e924fd012f315f2ef
Author: CodingCat <zhunans...@gmail.com>
Date: 2016-10-23T17:57:31Z
SPARK-18058
commit e0d806a5dc7698079f188851044b3cc1e0e39bb3
Author: CodingCat <zhunans...@gmail.com>
Date: 2016-10-23T17:59:57Z
SPARK-18058
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